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<h1>标题</h1>
<h2>标题</h2>
<h3>标题</h3>
<h4>标题</h4>
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<p>段落</p>
<input type="text"/>
<button>百度一下</button>
<div>div</div>
<a href="http://www.mayn.cn">宁美国度</a>
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<img src="images/download.jpg" alt="图片"/>
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